Most games should be mapped for Playstation controllers, but pretty much everyone maps for XBOX controllers for Linux. I don't know why, but that's how it is. The Steam controller can be forcibly mapped for any game, even games that don't use controllers. Though, it has issues such as not being good for FPS games due to not having a second thumb stick for looking. I have a couple Steam controllers, and an XBOX 360 wired controller for my Steam machine. (and a keyboard/trackpad combo)